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1.3 Mission planning

1.3.1 Nominal mission planning

The global coverage of the GOMOS measurements is made possible by the large number of star targets suitable for occultation measurements. Depending on the time of the year, there are about 150 to 300 stars bright enough for GOMOS to track and which are in its field of view at specific times during an orbit. Since the actual occultation time windows often overlap with each other, they can not all be observed. Therefore a number of alternative occultation sequences can be generated. The GOMOS mission planning sets the sequence of occultations to be measured, which fulfil at the best the scientific requirements and the mission objectives (long-term monitoring, campaign and specific events objectives), by taking into account the set of possible occultations and the corresponding mission planning database.